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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'bf5029be051c685dc1cd4f779aa4177c25d5e2cd21ca0686c0c472747af866cf' 
  AND token = 'uTX1bpe4JEc0mbmMt1z75U8VMfOlVtzXd1GNMMwWUSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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