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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '954ca76c82e116cc24fa0cfe5ce535fe05e95dcc10b89da547bdc552ba1ff597' 
  AND token = '7shctoad6SdfTg+Bn7HnI+ozCNLp4y8BPbwIIqf+P60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}