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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'deb5227ced9a85bcfd19b80df4d9cec3779442cda530d9a63da005a11e384b20' 
  AND token = 'e5fHOq5pK951YF5hpNrUAFmZp15Ir5vRaJqhAIaD0ck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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