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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ced2fd15f1f7fb42b4922552ba2883af104b0091a190273b183d413d4020e3a7' 
  AND token = 'Af1/hQUkV2EmXYNORbfaWYVeUg7+xxaK8ZnLeRJ9WSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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