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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '42a5f3bc1b338165e496c87683b576a8f48e0e99fa9d30460d17286b1bef8bd5' 
  AND token = 'jnv3n5ZI483j8ej9iafV4WoN6afgdtQ8l24v/j6o5tU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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